The invention discloses a preparation method and applications of a compound-PCM-based heat-conductive anticorrosion paint. The preparation method comprises following steps: a certain amount of liquidparaffin is uniformly mixed with a molecular sieve mesoporous material; an obtained mixture is introduced into a ground-in flask; refrigeration is carried out on a vacuum rack with liquid nitrogen, and air in molecular sieve pores is removed; liquid nitrogen is removed, and vacuum pumping is stopped. The compound-PCM-based heat-conductive anticorrosion paint contains a compound PCM material whichis introduced into mesoporous molecular sieve through cooling-vacuum pumping of phase change material liquid paraffin; a pore-enlarging agent is added in preparation process of the molecular sieve, sothat the molecular sieve is provided with a relatively large three dimensional open-framework structure, full filling with phase change liquid paraffin material is realized, the obtained compound-PCM-based heat-conductive anticorrosion paint is capable of maintaining the energy storage and temperature regulating performance of the liquid paraffin phase change material, and is provided with the high heat stability and water resistance of the mesoporous molecular sieve.